Based on the characteristics provided in the chart:
- The Thirty is described as "tyrannical rulers" who "made new laws" and "used exile and force," which aligns with the definition of an oligarchy—where a small group controls power.
- The ecclesia is noted for having an "assembly" that voted on issues and allowed all members to voice their concerns, which is indicative of a democratic system.
- The Mycenaean Palace had a "palatial society with a wanax" (a king), and a "Council of elders called Gerousia," which suggests a monarchy with a structured leadership.
Therefore, the accurate statement is:
The Thirty was an oligarchy, the ecclesia was a democracy, and the Mycenaean Palace was a monarchy.